沧东凹陷沙河街组低熟烃源岩生烃特征

摘要

Through the course of the preliminary exploration,we know that there may be immature oil and gas from the Shahejie source rocks in Cangdong sag,but the Shahejie formation source rocks have not been carried out a com-prehensive study. This paper mainly deals with the distribution of Shahejie source rocks in Cangdong sag,their or-ganic matter abundance,their types of organic matters,and the thermal evolution of hydrocarbon generation and ex-pulsion characteristics,then carries a comprehensive study on immature oil and gas generation. These studies have shown that the Shahejie source rocks buried although lighter,low evolution degree,but widely distributed,large thickness,high organic matter abundance,type of good. As to the hydrocarbon generation and expulsion simulation and thermal evolution,etc,the immature source rocks have the ability of immature oil and gas generation.%通过对前期勘探历程了解，认识到沧东凹陷沙河街组烃源岩可能形成低熟油气，但对于沙河街组浅凹陷的烃源岩未开展过全面的研究。因此，主要针对沧东凹陷沙河街组烃源岩分布、有机质丰度、有机质类型、热演化特征和生排烃特征，开展低熟泥页岩油气生成综合研究。研究表明沧东凹陷沙河街组烃源岩虽然埋藏偏浅，演化程度低，但分布范围广、厚度大、有机质丰度高、类型好，从生排烃模拟实验和热演化等方面看，具备形成未熟-低熟油气的能力。